<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!--卡片视图区域 -->
        <el-card>
            <!-- 头部警告区 -->
            <el-alert
                title="注意，只允许设置第三级分类设置相关参数"
                type="warning" :closable="false" show-icon>
            </el-alert>
            <!-- 选择商品分类区 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类</span>
                    <!-- 选择商品分类级联选择器 -->
                     <el-cascader
                        v-model="selectedKeys"
                        :options="cateList"
                        :props="{ expandTrigger: 'hover', value: 'cat_id', label: 'cat_name', children: 'children',}"
                        @change="CatChanged">
                    </el-cascader>
                    <!--  -->
                </el-col>
            </el-row>
            <!-- Tab 页签区 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数面板 -->
                <el-tab-pane label="用户管理" name="many">动态参数
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性面板 -->
                <el-tab-pane label="配置管理" name="only">静态属性
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="editDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <!-- 展开行 -->
                            <template slot-scope="scope">
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入文本框 -->
                                <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                    >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话框 -->
        <el-dialog
            :title="'添加'+titleText"
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClose">
            <el-form :model="addForm" ref="addFormRef" :rules="addFormRules" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog
            :title="'修改'+titleText"
            :visible.sync="editDialogVisible"
            width="50%"
            @close="editDialogClose">
            <el-form :model="editForm" ref="editFormRef" :rules="editFormRules" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
            // 商品分类列表
            cateList: [ ],
            // 级联选择框双向绑定的数组
            selectedKeys: [],
            // 被激活的页签名称
            activeName: 'many',
            // 动态参数的数据
            manyTableData: [],
            // 静态参数的数据
            onlyTableData: [],
            // 添加对话框的显示与隐藏
            addDialogVisible: false,
            editDialogVisible: false,
            addForm: {},
            editForm: {},
            addFormRules: {
                attr_name:[
                    {required:true, message: '请输入参数名称', trigger:'blur'}
                ]
            },
            editFormRules: {
                attr_name:[
                    {required:true, message: '请输入参数名称', trigger:'blur'}
                ]
            },
            // 控制按钮与文本框的切换显示
            inputVisible: false,
            // 文本框输入的内容
            inputValue: '',
        }
    },
    created() {
        // 获取所有商品分类
        this.getCateList()
    },
    methods: {
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败！')
                }
            this.cateList = res.data
        },
        // 级联选择框选中项变化会触发这个函数
        CatChanged(){
            this.getParamsData()
        },
        // tab 页签点击事件的处理函数
        handleTabClick() {
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData() {
             if(this.selectedKeys.length !==3){
                this.selectedKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 根据所选分类的ID和当前面板，获取参数
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: this.activeName}})
            if(res.meta.status !==200){
                return this.$message.error('获取列表参数失败')
            }
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                item.inputValue = ''
            })
            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
            
        },
        // 监听对话框关闭
        addDialogClose(){
            this.$refs.addFormRef.resetFields()
        },
        // 添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid)return 
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 201) {
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加成功')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        async showEditDialog(id){
            const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, {
                params: {attr_sel: this.activeName}
            })
            if(res.meta.status !==200 ){
                this.$message.error('获取数据失败')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        editDialogClose(){
            this.$refs.editFormRef.resetFields()
        },
        editParams(){
            this.$refs.editFormRef.validate(async valid => {
                if(!valid)return 
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.editForm.attr_sel
                })
                if(res.meta.status !==200){
                    return this.$message.error('修改失败')
                }
                this.$message.success('修改成功')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        editDialogClose(){
            this.$refs.editFormRef.resetFields()
        },
        async removeParams(id){
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err => err)
            if(confirmResult !=='confirm'){
                return this.$message.info('已取消删除')
            }
            // 删除用户信息
            const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
            if(res.meta.status !==200) {
                return this.$message.error('删除参数失败')
            }
            this.$message.success('删除参数成功')
            this.getParamsData()
        },
        // 文本框失去焦点或者回车触发
        handleInputConfirm(row){
            if(row.inputValue.trim().length === 0){
               row.inputValue ='' 
               row.inputVisible = false
               return
            }
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 发起请求保存这次操作
            this.saveAttrVals(row)
        },
        // 讲arrt_vals 保存到数据库
        async saveAttrVals(row){
            const{data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if(res.meta.status !==200){
                return this.$message.error('修改参数失败')
            }
            this.$message.success('修改参数项成功')
        },
        // 点击按钮展示文本输入框
        showInput(row){
           row.inputVisible = true
           this.$nextTick(_ => {
           this.$refs.saveTagInput.$refs.input.focus();
        })
        },
        // 删除对应的参数可选项
        handleClose(i, row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    computed: {
        // 按钮是否被禁用
        isBtnDisabled(){
            if(this.selectedKeys.length !==3){
                return true
            }
            return false
        },
        // 当前选中三级分类的ID
        cateId() {
            if(this.selectedKeys.length ===3 ){
                return this.selectedKeys[2]
            }
            return null
        },
        // 对话框标题文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag {
    margin: 10px;
}
.input-new-tag{
    width: 120px;
}
</style>